Rude ore mining method for ion type RE ore

Abstract

The invention discloses a method for mining ion-type rare earth mines (ion-adsorption-type rare earth mines leaching) in the original mine. The static pressure grouting method of geotechnical engineering is used to inject liquid, and an anti-seepage layer is established in the bottom of the mine layer. The mountain body is mainly composed of V It is composed of drainage holes, liquid injection holes, tunnels, anti-seepage layers and other facilities. The plan is to find out the distribution and thickness of the rare earth ore layer on the mountain first, then design the tunnel to the junction of the rich ore bottom layer and the lean ore layer, and then set V-shaped drainage holes in the upper layer of the soil layer on both sides of the tunnel, and finally under the drainage hole Set anti-seepage layer or horizontal drainage hole; and set layered liquid injection hole or liquid injection tunnel in the mine bed and set drainage hole in the same tunnel to achieve layered liquid injection and layered liquid collection. The invention solves the environmental protection problems caused by the adsorption of rare earth ions by the soil colloid in the rare earth-free ore soil layer and water and soil loss caused by mining.

Description

Technical field [0001] The present invention relates to a mining method of ion-type rare earth ore mining (ion-adsorption type rare earth ore leaching), specifically applying the static pressure grouting method commonly used in geotechnical engineering to inject liquid in the original mountain leaching mining. Build an anti-seepage layer at the bottom of the ore deposit; and adopt layered liquid injection method and layered liquid collection method when injecting liquid in the ore bed. Background technique [0002] The known ion-adsorption type rare earth ore former mountain leaching method is made up of liquid injection holes, tunnels and drainage holes arranged above the impermeable layer at the foot of the mountain or the soil layer containing groundwater (see figure 1 ). When chemical reagents (now (NH 4 ) 2 SO 4 For example, the same below) After injecting from the liquid injection hole on the top of the mountain, it penetrates into the soil layer, and reacts with t...

AI Technical Summary

Problems solved by technology

The shortcoming of this method is: 1. because the rare earth ore layer is mainly distributed in the strong weathered layer of the mountain body above the mountainside, the rare earth ore content of the mountain body below the mountainside is low or has no rare earth ore, and when the rare earth solution penetrates into this layer, the rare earth ion is absorbed by the soil colloid A large amount of adsorption, the rare earth grade of the solution that finally flows into the tunnel is very low, if the adsorbed rare earth is to be leached out, it is necessary to increase (NH 4 ) 2 SO 4 and the amount of water; or when the permeability coefficient of the soil layer under the tunnel is large, the rare earth solution will infiltrate into the soil layer below the tunnel, resulting in less rare earth solution collected

2. The liquid injection method used in the existing ion-adsorption type rare earth ore leaching is the shallow layer injection method

The shallow injection method has the following shortcomings: a. Due to the structure of the mountain, the inhomogeneity of the permeability coefficient of each part of the mountain body, the same method of injection at the same time at the same time, the place with a small permeability coefficient (NH 4 ) 2 SO 4 Solution penetration is less, most (NH 4 ) 2 SO 4 The solution infiltrates along the soil layer with high permeability coefficient of the mountain

From the above reasons, it can be seen that due to the adsorption of soil colloids, it will adsorb (NH 4 ) 2 SO 4 NH4+ in solution, which leads to (NH 4 ) 2 SO 4 The amount of water used increases, and the increased amount of water leads to a lower grade of rare earth in the rare earth solution flowing into the tunnel, resulting in higher production costs; at the same time, due to excessive and too fast injection, it is easy to cause landslides and cause environmental problems

Images